Mortuary + Bile Urchin + Bolas's Citadel + Embalmed Ascendant

Mortuary

Bile Urchin

Bolas's Citadel

Embalmed Ascendant

How it works

1. Activate Bile Urchin by sacrificing it.
2. When Bile Urchin dies, Mortuary and Embalmed Ascendant trigger.
3. Resolve the Mortuary trigger, putting Bile Urchin from your graveyard onto the top of your library.
4. Resolve the Embalmed Ascendant trigger, causing you to gain 1 life and each opponent to lose 1 life.
5. Resolve the Bile Urchin ability.
6. Cast Bile Urchin from the top of your library by paying 1 life.
7. Repeat.

This elegant loop turns a humble goblin into an inescapable doom engine by exploiting the synergy between the top of your library and the graveyard. With Embalmed Ascendant boosting your max speed and empowering your creatures' demises, sacrificing Bile Urchin drains your opponents while gaining you life to offset the costs. Mortuary ensures the Urchin never truly leaves you by immediately recycling it onto your library, where Bolas's Citadel allows you to recast it for a tiny slice of life over and over again.